A tool designed to estimate the resistance to blood flow within the pulmonary vasculature. It utilizes mathematical formulas, incorporating variables such as mean pulmonary artery pressure, pulmonary artery wedge pressure (or left atrial pressure), and cardiac output. The result is a numerical value, typically expressed in Wood units or dyness/cm, providing a quantitative assessment of pulmonary vascular impedance.
This calculation offers critical insights into the hemodynamics of the pulmonary circulation. It assists in diagnosing and managing various cardiopulmonary conditions, including pulmonary hypertension, congenital heart defects, and chronic obstructive pulmonary disease. Historically, obtaining an accurate estimation was complex, requiring invasive procedures. The development of non-invasive or less-invasive methods, combined with readily accessible calculation tools, has significantly improved patient care and monitoring capabilities.
